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The effect of temperature and pozzolanic materials on the electrical conductivity of blended cement pastes at different porosities
The electrical conductivity of a range of ordinary Portland cement based mortars was studied over a period of 6h hydration. The influence of water/cement (w/c) ratio (0.20, 0.25 , up to 0.40), thermal cycling curing temperature (20, 30 and 40 deg C), and the pozzolanic additions (35% fly ash, 35% slag and (35% fly ash + 35% slag) to the OPC separately) on conductivity was investigated, and the activation energy Eg established for conduction processes. Eg was found to be system specific and was in the range about 0.12 up to about 0.212 eV at w/c = 0.20 . Results indicate that the changes in the electrical conductivity and the activation energy of each system mainly depend on the microstructural changes, occurring during the hydration mechanism. These changes are not constant with the curing time and the w/c ratios. The proper consideration in the change of the pore microstructure leads to the optimization of the finer pores microstructure which occurs at the w/c ratios 0.30 and 0.35 in all various cementitious systems. Those ratios are considered to be the optimum ratios for reducing the porosity.
The effect of temperature and pozzolanic materials on the electrical conductivity of blended cement pastes at different porosities
The electrical conductivity of a range of ordinary Portland cement based mortars was studied over a period of 6h hydration. The influence of water/cement (w/c) ratio (0.20, 0.25 , up to 0.40), thermal cycling curing temperature (20, 30 and 40 deg C), and the pozzolanic additions (35% fly ash, 35% slag and (35% fly ash + 35% slag) to the OPC separately) on conductivity was investigated, and the activation energy Eg established for conduction processes. Eg was found to be system specific and was in the range about 0.12 up to about 0.212 eV at w/c = 0.20 . Results indicate that the changes in the electrical conductivity and the activation energy of each system mainly depend on the microstructural changes, occurring during the hydration mechanism. These changes are not constant with the curing time and the w/c ratios. The proper consideration in the change of the pore microstructure leads to the optimization of the finer pores microstructure which occurs at the w/c ratios 0.30 and 0.35 in all various cementitious systems. Those ratios are considered to be the optimum ratios for reducing the porosity.
The effect of temperature and pozzolanic materials on the electrical conductivity of blended cement pastes at different porosities
Al-Salami, A.E. (author) / Al-Hajry, A. (author) / Ahmed, M.A. (author) / Taha, S. (author)
Silicates Industriels ; 71 ; 81-87
2006
7 Seiten, 6 Bilder, 3 Tabellen, 23 Quellen
Article (Journal)
English
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